What grades of stainless steel are commonly used in drinking water pipes?

Stainless steel pipes have become a popular choice for drinking water systems due to their exceptional durability, resistance to corrosion, and ability to maintain water quality. The grades of stainless steel used for drinking water pipes are primarily 304 and 316, each offering distinct properties suited to different needs and environments.

Grade 304 stainless steel, often referred to as 18/8 stainless steel, contains approximately 18% chromium and 8% nickel. This grade is widely used in various applications, including drinking water pipes, because of its excellent resistance to oxidation and corrosion. It is highly durable and can withstand a range of temperatures, making it suitable for both hot and cold water systems. The chromium content in grade 304 provides a passive layer of chromium oxide on the surface, which protects against rust and staining, thereby ensuring that the water remains clean and free from metallic taste or contaminants. This grade is also relatively affordable and has a broad range of applications beyond plumbing, such as in kitchen appliances and food processing equipment.